In New York’s continuing battle against the rodents that frequent the city, officials reveal the latest machination against the rats. According to New York officials, the scheme involves three things: a machine, a trap door, and a pool full of liquid alcohol. According to Anthony Giaquinto, the president of Rat Trap, who imports the device, rats get knocked out and “drown eventually” in the liquid pool contained inside a bucket. A month long trial in Brooklyn was held, where 107 rodents were lured and killed, as BBC detailed:

The rats are attracted with bait by a machine and sent through a trap door straight into a pool of alcohol-based liquid.

it's a bucket which lures rats and then sends them to their death.

The rodent dies in the tank - which can hold up to 80 rat carcasses.

During a demonstration of the machine sanitation workers opened the container, showing several dead rats floating in a green liquid.

Funny, it's functionally the same principle as a rodent killing device outlined in a 19th century newspaper article I read a while back, except that used, if I recall, just a tall bucket of water in which a brick is placed; I believe bait was placed on the brick, critter goes after bait, can't jump out, drowns.